What I don't get is why Argentina's economy has so much problems and inflation compared to Brazil, what is it they are doing differently? Why don't they do whatever it is Brazil is doing to be stable?
Brazil suffered many times the exact same hyperinflation Argentina now faces. We have gone through several currencies now. If you search HN for Brazil, one of the top posts is about the creation of the real and how they convinced the population that this time it was somehow going to be different.
https://news.ycombinator.com/item?id=1757716
The real is merely 30 years old and has already inflated about 1100%. 1 BRL@1994-07 is about 12 BRL@2023-10. Somehow salaries don't seem to increase as much.
Argentina is especially known for Juan Perón [1], who implemented a lot of socialist policies that were quite popular with the working class but were not generally helpful for Argentina.